update private design metrics

./designs/gf12/swerv_wrapper/ --variant base --failing --tighten
[WARNING] Multiple clocks not supported. Will use first clock: core_clock: 1500.0000.
| Metric                                        | Old      | New      | Type     |
| ------                                        | ---      | ---      | ----     |
| detailedroute__route__wirelength              |  2132201 |  2491797 | Failing  |
| finish__timing__setup__ws                     |  -153.25 |      0.0 | Tighten  |
| finish__timing__drv__hold_violation_count     |      638 |      538 | Tighten  |

Signed-off-by: Augusto Berndt <[email protected]>

Author: gudeh